This was on sale for only €3 today:

I decided to take that as a sign, directed at me personally by a supernatural being of some kind who just happens to be really invested in getting to see me with purple hair. ;) I'd been hesitating because it wasn't my favourite shade of purple and I was more interested in blue, anyway. However, the chances of ever finding blue dye for cheap in a boring small town store are pretty slim ...
I'm going to wait until the black is mostly washed out before I try it, though. I can't imagine it would work very well on top of a different dye.

I decided to take that as a sign, directed at me personally by a supernatural being of some kind who just happens to be really invested in getting to see me with purple hair. ;) I'd been hesitating because it wasn't my favourite shade of purple and I was more interested in blue, anyway. However, the chances of ever finding blue dye for cheap in a boring small town store are pretty slim ...
I'm going to wait until the black is mostly washed out before I try it, though. I can't imagine it would work very well on top of a different dye.